Guide apparatus for the propeller stream of vessels



Sept. 9, 1930. I J. B. HIORTH 1,775,395

GUIDE APPARATUS FOR THE PRDPELLER STREAM OF VBSSELS I Filed Jan. 3, 1929m I I .A/ 0

III

Patented Sept. 9, 1930 i 1 775 395 UNITED STATES PATENT OFFICE aJENS'BRODERS EN HIORTH, F HOVIK, NEAR OSLO, NORWAY GUIDE APPARATUS FORTHE PROPELLEB STREAM 0F VESSELS Application filed January 3, 1929,Serial No. 330,034, and in Germany January 7, 1928.

It is necessary in order to obtain the best an elevational view of anembodiment of my possible eiiiciency'of a ships propeller to invention;

adapt the propeller to the. lines of the ship, Fig. 2 shows sectionsthrough the vertical in other words to design the propeller with guidevanes taken on the lines 1-1, 11-11 'due consideration to the suction ofthe proand IIIIII of Fig. 1; and

peller peculiar to each individual ship and Fig. 3 shows sections of thehorizontal to the wake of the ship. With this end in guide vanes takenon the lines IV-IV, V-V

, View the use of so-cal1ed wakepropellers has and VI-VI of Fig. 1.

been suggested in which the varying wake Referring to the drawings indetail, 1 des- 0 conditions in the different spheres of action ignatesthe propeller and 2 a rudder post to of the propeller have been takeninto con which vertical guide vanes 3 and horizontal sideration. guidevanes 4 are attached. These guiding The object of the present inventionis to vanes, as clearly indicated in the sectional form the guideapparatus for the propeller views of Fig. 2 and Fig. 3, are of minimum15 stream, arranged forward of and/or behind thickness near the axis ofthe propeller l and the propeller, due consideration being givengradually increase in thickness to a point suction and wake conditionsrespectively in near the outer end or tip of the vane. such a way thatimproved efliciencyof pro- Having now particularly describedand'aspulsion will be obtained. certained the nature of my saidinvention and '20 In prior guide apparatus constructions the inwhatmanner the same is to be performed, 7

vanes, regardless of. whether they were ar- I declare that what I claimis:

. ranged vertically, horizontally or inclined, Guide apparatus for thepropeller stream always have been carried out with constant 0f vessels,in which the sections Of the guide maximum thickness or with a maximumvanes are of minimum thickness near the pro- 25 thickness decreasingoutwardly from the pro peller axis and increase in thickness outpelleraxis. wardly from the propeller axis to a point According to the presentinvention the n r h Outer end 1 tlp f the Vane.

7 guide apparatus, with due consideration to D N HIOBTH- the suction ofthe propeller and to the wake, is so constructed that the sections ofthe vanes are comparatively thin in the sphere nearest to the propelleraxis and gradually increase in thickness outwards. The sections, inother respects, may be shaped differently as in usual 'guide apparatus,symmetrically or asymmetrically, with straight or curved centre line,plane, convex or concave pressure surface, wing shaped or withothershapes adapted to meet the particular conditionsin each case. a

The guide apparatus may be attached to p the hull of the vessel or tothe rudder post,

or to the rudder turnable with the same. i 45 Also the rudder bodyitself, especially bal- V anced vrudders, may be formed as a guideapparatus with more narrow sections near the propeller axis andincreasing sections upwards and downwards.

50 In the accompanying drawing: Fig. 1 is A ico'

